Soda-calciner.



G. H. MARSHALL.

SODA GALGINER.

APPLICATION FILED JAILQ. 1911.

1,014,314, Patented Ja11.9,1912.

42 SHEETS-SHEET 1.

www Y 6 OHMMQQQZ.

G. H. MARSHALL.

SODA CALCINER.

APPLICATION FILED J1N.91911.

1,014,311@ i Patented t1111.9, 1912.

2 SHEETS-SHEET 2.

@ O 5 gnou/VCO@ UNITED STATES PATENT OFFICE.

GEORGE H, MARSHALL, F NEW YIORKfN. Y.

SODA-CALCINER.

Application filed January 9, 1911.

To all whom 'it may concern.'

Be it known that I, GEORGE H. MARSHALL, a citizen of the United States, residing at New York, in the county of New York and State of New York, have invented certain new and useful Improvements in Soda-Calciners, of which the following is a specification, reference being had to the accompanying drawings.

This invention relates to improvements in furnaces, especially such as are used in` recovering soda from the black or waste liquor produced in the manufacture of wood pulp by the soda or sulfate processes in connection with an evaporator, a rotary furnace, and a fire box, in a plant for carrying on the work of recovering the soda, one object of the invention being to effect improvements in the construction of a furnace of this character whereby the same is rendered movable, and is adapted to be expeditiously replaced by another in the event it becomes worn or injured, so as to allow the other devices and apparatus in the plant to continue in operation, a further object of the invention being to effect improvements in the construction of the furnace whereby worn and injured parts thereof may be economically and expeditiously replaced and renewed.

In the accompanying drawings-Figure 1 is a vertical transverse. sectional view of a furnace constructed in accordance with my invention. Fig. 2 is partly a plan and partly a horizontal sectional view of the same on the plane indicated by the line 2 2 of Fig. 1. Fig. 3 is a diagrammatic elevation of-a soda recovering plant in whichmy improved furnace is employed. Fig. 4 is a diagrammatic plan of the same. i

Referring especially to Figs. 3 and 4 of the drawings, the evaporator for concentrating the black or waste liquor and for recovering the soda ash from the gases which pass therethrough from the furnaces, is indicated at 1, and comprises essentially a tank 2, provided at oppositeends with intake and outlet flues 3, 4 and in which tank are a series of rotating baffles 5, which are partly submerged in the liquor in the tank for concentration, andthe upper portions Specification of Letters Patent.

Atrack from one point to another. hearthor bottom 18 of the furnace is com- Patentcd J an. 9, 1912.

Serial No. 601,673.

of which are in the space above the water line or liquor line, in the evaporating tank, and exposed to the action of the hot gases which carry soda ash dust and pass longitudinally through the evaporator. The particular construction of this evaporator forms the subject matter of another application for Letters Patent of the United States, eXecuted by me simultaneously with the present case, Serial No. 601,674.

The usual rotary furnace is indicated at 6, the discharge thereof communicating with the intake flue 3 of the evaporator. The discharging end of the rotary furnace is in communication with the discharge lue 7 of a fire box 8.

On opposite sides of the fire boX I ,here

by an intake flue, tothe fire box. i When any one of the furnaces gets out of order, it is disconnected from the fire box, and another connectedto the lire box immediately and used in its place so lthat the operation of the other devices or apparatus of the plant is not interrupted by injury to or the wearing out of any one of the furnaces.

Referring to Figs. 1 and 2 I will now describe t-he construction of one of my furnaces, `it being understood that they are identical in construction. The base 11 of the furnace is a ltruck platform comprising langle side beams 12, and cross beams 13,

which are secured together, the floor 14 be? ing preferably composed of plate metal, such as iron or steel., The flanged wheels-15 of the axle 16 are mounted on track rails 17. so that the furnace may be moved on the posed of fire brick laid on the floor of the truck platform, andv is circular in shape. The cylindrical wall of the furnace is composed of alternately disposed water rings 19, and brick or masonry rings 20. The water rings are hollow and are made of steel or iron, and each of the said rings is provided at suitable points with radial bosses The 21 which have vertically alining openingsv 22. Certain of the water rings and masonry rings at the lower side and near the. top of the furnace are provided each in one side with an opening, the said openings of the said rings, forming a discharge opening 23 at the bottom of the furnace, and a flue opening 24 near the top thereof. The top 25. of the furnace is also made ofiron or steel, is circular in form provided with bosses 26, and is hollow, and provided with a water compartment 27. Said cap is further provided with a feed opening 28 and with a blast opening 29. The water rings, masonry rings, and cap, having been assembled, as shown in Fig. l,they are then securely fastened together, by. means of bolt rods 30, which extend through the openings in the bosses of the said water rings and cap. The lining 31 of the'furnace is constructed of fire brick. Water circulatingpipes 32 are connected to thewater rings and to the cap, and when the furnace isl in' use maintain a circulationl of water through the compartments formed in and by the said water rings and cap. Hence the Water rings and cap are prevented from becoming unduly heated, and the masonry rings are also measurably protected from overheating so that the life of the furnace is greatly prolongedff The air blast pipe 33 extends downwardly through a water jacket 34 and is supplied with a water feed pipe 35 and a water outlet pipe 36, the said pipes serving to maintain a circulation of water through the said water jacket and around the discharge end of the air blastpipe.- The ii'ue 37 is provided with a water jacket 38, and has at its inner end a circular yflange 39 which may be secured by bolts 40, to certain of the water rings and also to theI water cap so as to dispose the flue in registration withf the iiue opening 24. This water j acketed Hue is con-` nected to'one side of the lire box 8. Y

The tracks 17 are so laid and arranged that when one'of the furnaces on either side of the fire box gets out of order and requires repair it may be disconnected from the ,fire box, moved out of the way, and another run up to the fire boX and connected thereto in a very short space of time, so that the entire plant may be kept continuously in operation, and not be put out of commis.l

sion in the event of injury to one of the portable furnaces.

In the operation of wvmy invention the black liquor after concentration in the evaporator flows therefrom into the rotary furnace and issues from the rotary furnace, after combustion therein, as a thick heavy black ash, which is discharged from the rotary furnace and piles up on the Hoor formed by the top of the iire box, between the portable furnaces. This bla-ck ash is alternately very high in carbon which if burned oif'afl fords heat for additional evaporation.

ous working of the plant as a whole, but

generally very little fuel is required, the liquors being very rich in combustible material. The black ash is fedtinto the portable furnace or furnaces through the feed openings 28. These furnaces are connected to the fire box and a fire is maintained in the fire box, hence the black ash isignited and is subjected to the action of the air blasts, so that the black ash is caused to burn very freely and fiercely, thegases and products of combustion passing from the portable furnaces `through the flues 37, into the fire box, from the latter, into and through the rotary furnace', andv from the rotary furnace into and through vthe evaporator, so that the heat and gases from the concentrated and converted black ash are used in the operation of the evaporator and rotary furnace as will be understood. The action in the portable furnaces is the conversion of sodium sulfate to sodium suld, and carbonate, and the fluXing and corrosive action of these molten chemicals is very severe on the furnace linings. My improved construction of furnaces enables the same to withstand such corrosive action and also enables repairs toy be readily and cheaply effected, since when any of the rings, whether water rings or masonry rings, or both, become inf jured and worn, the parts of the furnace may be readily disassembled and new parts substituted for lthe worn parts. Moreover, by providing a plurality of furnaces for use successively in connection with the fire box, when any one of the vfurnaces needs repairs, another may be expeditiously substituted for it, and the operation of the plant continued uninterruptedly.

1. A furnace of the class described having its wall composed of separable, superposed, alternatelyl disposed water rings and rings of refractory material.

2. `A furnace of the class described having its wall composed of separable, superposed,

disposed water rings and masonry rings.

3. A furnace having a wall formed of a series of superposed, separable, alternately disposed refractory rings and water rings, and a cap, said water rings and cap having bosses projecting-from the outer sides there-y of and bolt rods connecting the said bosses sides, bolt rodsconnecting the bosses of said Y. diameter so that eachA extends entirely water rings and cap and a fire box and linthrough the wall. 10 ing. i In testimony whereof I hereunto aiix my 5. A furnace of the class described having signature in the lpresence of two witnesses. its wall composed of superposed, alternately GEORGE H. MARSHALL. disposed water rings and rings of refractory Witnesses: material,- said water rings and refractory J. T. CHASE,

rings corresponding in interior and exterior Taos) R. H. MURPHY. 

